REAL-TIME 2.5 GS/S COHERENT OPTICAL RECEIVER FOR 53.3-GB/S SUB-BANDED OFDM

  • Chandrasekhar S.
  • Kaneda N.
  • Qi W
  • Shieh W.
  • Xiang L
  • Young-Kai C

A real-time receiver for the coherent optical orthogonal frequency-division multiplexing (CO-OFDM) detection is realized in a field-programmable gate array (FPGA). Each building block of the CO-OFDM receiver, such as symbol synchronization, channel estimation, and phase estimation is described and discussed in respect of special technical requirements of real-time implementation. The ...

ON SIGNAL-TO-NOISE RATIO-ASSISTED CROSSTALK CHANNEL ESTIMATION IN DOWNSTREAM DSL SYSTEMS

  • Guenach M.
  • Louveaux J.
  • Maes J.
  • Peeters M.
  • Vandendorpe L.
  • Whiting P.

Downstream (DS) crosstalk channels of digital subscriber line systems can be estimated based on the reported signal-to-noise ratio (SNR). In the case of an already active victim line (VL) impacted by the joining of a new disturber line (DL), sending perturbing signals on the VL and reporting the SNRs allow ...

ROOM-TEMPERATURE CONTINUOUS-WAVE METAL GRATING DISTRIBUTED FEEDBACK QUANTUM CASCADE LASERS

  • Carras M.
  • Marcadet X.
  • Parillaud O.

We report on the design and elaboration of continuous wave (cw) distributed feedback quantum cascade lasers (QCLs) using a simple metal grating approach without epitaxial regrowth, neither for the grating nor for the thermal extraction. Room temperature cw single monomode QCLs with 30 dB side mode suppression ratio are demonstrated ...

DIPLEXER WITH INTEGRATED FILTERS AND PHOTODETECTOR IN GE–SI USING GAMMA -{X} AND GAMMA -{M} DIRECTIONS IN A GRATING COUPLER

  • Doerr C.
  • Earnshaw M.
  • Long C
  • Rasras M.
  • Weiner J.

We demonstrate a central-office-type diplexer in which the filter and photodetector are monolithically integrated on a silicon-on-insulator substrate. The photonic integrated circuit receives a 1577-nm signal from an external laser and sends it to the fiber link using a two-dimensional grating coupler. The same grating coupler receives a 1270-nm signal ...

CAPACITY OF CHANNELS WITH FREQUENCY-SELECTIVE AND TIME-SELECTIVE FADING

  • Caire G.
  • Shamai S.
  • Tulino A.

This paper finds the capacity of single-user discrete-time channels subject to both frequency-selective and time-selective fading, where the channel output is observed in additive Gaussian noise. A coherent model is assumed where the fading coefficients are known at the receiver. Capacity depends on the first-order distributions of the fading processes ...

MODELING THE PERFORMANCE OF FDL BUFFERS WITH WAVELENGTH CONVERSION

  • Laevens K.

In optical burst switching and optical packet switching, contention of bursts (or packets) can be dealt with most effectively through a combination of wavelength conversion and optical buffering. While this is generally accepted in the optical networking community, and validated through simulation, analytic performance results for optical buffers were limited ...

A CORRELATION FOR THE DETECTION OF TIME AND FREQUENCY OFFSETS

  • Jeanclaude I
  • Purohit V
  • Wilford P.

A correlation is proposed for use to detect time and frequency offsets in a received signal in a digital transmission system. Applications include time and frequency synchronization in a single frequency network; pre-distortion for high power amplifiers in a transmitter. The correlation is formed with the products of two pairs ...

EXPERIMENTAL ASSESSMENT OF INTERACTIONS BETWEEN NONLINEAR IMPAIRMENTS AND POLARIZATION-MODE DISPERSION IN 100-GB/S COHERENT SYSTEMS VERSUS RECEIVER COMPLEXITY

  • Bertran Pardo O.
  • Bigo S.
  • Charlet G.
  • Mardoyan H.
  • Renaudier J.
  • Salsi M.
  • Tran P.

We investigate experimentally the tolerance to polarization-mode dispersion (PMD) of 100-Gb/s polarization- division-multiplexing quaternary phase-shift keying systems under nonlinear impairments. We show that nonlinear effects decrease the robustness of the system against PMD. Moreover, we study the dependence of this robustness on the complexity of the receiver.

COEXISTENCE STUDIES FOR 3GPP LTE WITH OTHER MOBILE SYSTEMS

  • Tatesh S.

To ensure LTE systems can coexist with other mobile systems operating in the same geographical area, or the LTE Base Station (BS) can be collocated with other mobile system BSs, coexistence studies for LTE with other systems have been carried out in 3GPP. In this article, we provide an overview ...

TRANSMISSION OF 16.4-BIT/S CAPACITY OVER 2550 KM USING PDM QPSK MODULATION FORMAT AND COHERENT RECEIVER

  • Bigo S.
  • Charlet G.
  • Dupuy J.
  • Mardoyan H.
  • Renaudier J.
  • Tran P.

A record capacity distance product of 41.8 Petabit/s middotkm is demonstrated. A total of 164 channels are modulated at 100 Gbit/s with PDM-QPSK format, packed with 2 bit/s/Hz information spectral density and recovered by off-line processing in a coherent receiver after 2550 km distance.

EXPERIMENTAL AND THEORETICAL LINEARITY INVESTIGATION OF HIGH-POWER UNITRAVELING-CARRIER PHOTODIODES

  • Achouche M.
  • Carpentier D.
  • Chtioui M.
  • Enard A.
  • Lelarge F.
  • Rousseau B.

In this letter, the third-order intermodulation distortion of a high-power InGaAs-InP unitraveling-carrier photodiode is examined. Based on experimental data, we have developed an analytical model using a harmonic balance method. The response-time reduction, under high-current operation, is identified as the main nonlinear mechanism before saturation occurss. In addition, a linearity ...

DE NOUVELLES REGLES POUR L’ECONOMIE DES COMMUNICATIONS

  • Marinho J.
  • Mukerjee S.

The communications industry continues to undergo tremendous change, not only in terms of technology that redefines the user's experience, but also in terms of business models that change the economic, social and competitive global industry dynamic.

ROUTE STABILITY IN MANETS UNDER THE RANDOM DIRECTION MOBILITY MODEL

  • Carofiglio G.
  • Chiasserini C-F
  • Garetto M
  • Leonardi E.

A fundamental issue arising in mobile ad hoc networks (MANETs) is the selection of the optimal path between any two nodes. A method that has been advocated to improve routing efficiency is to select the most stable path so as to reduce the latency and the overhead due to route ...

DEMONSTRATION OF A TUNABLE MICROWAVE-PHOTONIC NOTCH FILTER USING LOW-LOSS SILICON RING RESONATORS

  • Beals M.
  • Beattie J.
  • Carothers D.
  • Gill D.
  • Kimerling L.
  • Kun-Yii T
  • Michel J.
  • Patel S.
  • Pomerene A.
  • Rasras M.
  • White A.
  • Young-Kai C

We present a fully tunable multistage narrowband optical pole-zero notch filter that is fabricated in a silicon complementary metal oxide semiconductor (CMOS) foundry. The filter allows for the reconfigurable and independent tuning of the center frequency, null depth, and bandwidth for one or more notches simultaneously. It is constructed using ...

DYNAMIC EIGENSTATES OF PARAMETRIC INTERACTIONS IN RANDOMLY BIREFRINGENT FIBERS

  • Kogelnik H.
  • Mckinstrie C.

In fiber-based parametric devices employing nondegenerate four-wave mixing, there exist dynamic eigenstates for the signal and idler, for which there is no change of polarization as the waves propagate. For the case of parametric amplifiers with two pumps of arbitrary polarization, the eigenstates are the sum of the Stokes vectors ...

LOW-CHIRP 85-GB/S DUOBINARY MODULATOR IN INP USING ELECTROABSORPTION MODULATORS

  • Adamiecki A.
  • Buhl L.
  • Doerr C.
  • Raybon G.
  • Sauer N.
  • Sinsky J.
  • Zhang L.

In 2005, Griffin showed that an InP phase-shift-keying/duobinary Mach-Zehnder interferometer (MZI) modulator could achieve good transmission performance at 10 Gb/s, despite modest residual amplitude modulation in the phase modulators in the MZI (ratio of real to imaginary part of index change was ~0.1). Here we show that even strong amplitude ...

INCREASING DOWNLINK CELLULAR THROUGHPUT WITH LIMITED NETWORK MIMO COORDINATION

  • Huang H.
  • Shafi M.
  • Valenzuela R.

Single-user, multiuser, and network MIMO performance is evaluated for downlink cellular networks with 12 antennas per site, sectorization, universal frequency reuse, scheduled packet-data, and a dense population of stationary users. Compared to a single-user MIMO baseline system with 3 sectors per site, network MIMO coordination is found to increase throughput ...

TRUSTED PARTNERS CREATE OPTIONS FOR GROWTH

  • Ramirez J

Managed services help communication service providers address business transformation challenges and grow with next-generation services.

GLOBAL TRENDS DRIVE BUSINESS STRATEGIES

  • Bream K.
  • Poirault J-P

Competitive transformation strategies create revenue streams to fund investment required to deliver next-generation services.

THICK ABSORPTION LAYER UNI-TRAVELING-CARRIER PHOTODIODES WITH HIGH RESPONSIVITY, HIGH SPEED, AND HIGH SATURATION POWER

  • Achouche M.
  • Bernard S.
  • Carpentier D.
  • Chtioui M.
  • Enard A.
  • Jany C.
  • Lelarge F.
  • Pommereau F.
  • Rousseau B.

High responsivity backside-illuminated uni-traveling-carrier photodiodes (PDs) with a 1.2-mum-thick p-doped absorption layer are demonstrated. The fabricated PDs achieve simultaneously high speed, high responsivity, and good linearity under high-power operation. The measured responsivity at 1.55 mum is larger than 0.83 A/W at low photocurrent and increases up to 1 A/W at ...